Dingcheng (Chinese: 定城; pinyin: Dìngchéng) is a town and the county seat of Ding'an, in the northeast of Hainan Province, China. It has an area of 145 square kilometres (56 sq mi) and a population of 95,695 as of 2010. Historically, Dingcheng referred to the old town center beside the Nandu River. Around 2015, a newly developed part of Dingcheng is emerging to the southeast, extending to the east side of G98 Hainan Ring Expressway. This is commonly referred to as Taling and the original may be referred to as "Laocheng" (old town).